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吉田 寿雄*; 山本 旭*; 細川 三郎*; 山添 誠司*; 吉川 聡一*; 原 賢二*; 中村 充孝; 蒲沢 和也*; 田中 庸裕*
Topics in Catalysis, 64(9-12), p.660 - 671, 2021/08
被引用回数：2 パーセンタイル：10.95(Chemistry, Applied)Inelastic neutron scattering (INS) enables direct and selective observation of H species due to the extremely large incoherent neutron scattering cross section of a hydrogen atom. In the present study, the adsorbed H species on some heterogeneous precious metal catalysts supported by alumina and carbon black were investigated by in situ INS spectroscopy with a newly designed sample cell. Three alumina-supported metal catalysts having Pt, Pd, and Rh metal nanoparticles with different particle sizes exhibited different INS spectra in intensities and band distribution. Observation of the H species on the metal nanoparticles and the alumina surface revealed their properties. In addition, the H atoms stored in Pd nanoparticles were observed as palladium hydride. In contrast, the H species on a Pt catalyst supported by carbon black were found to be strongly adsorbed on the carbon support.
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inelastic neutron scattering and their reactivity with ethylene山添 誠司*; 山本 旭*; 細川 三郎*; 福田 良一*; 原 賢二*; 中村 充孝; 蒲沢 和也*; 佃 達哉*; 吉田 寿雄*; 田中 庸裕*
Catalysis Science & Technology, 11(1), p.116 - 123, 2021/01
被引用回数：6 パーセンタイル：33.04(Chemistry, Physical)Hydrogen (H) species adsorbed on catalyst surfaces are key intermediates in catalytic hydrogenation reactions over supported metal catalysts. However, individual identification of H species on the metal catalysts has not been established to date. Here, we elucidated the H species on Pt/AlO by the combination of inelastic neutron scattering (INS) and density functional theory (DFT). Several H species in the presence of H were successfully identified at different sites on the Pt surface and AlO support. The INS and FT-IR measurements revealed that the hydride/atop Pt-H, bridged perimeter/terrace Pt-H-Pt, and threefold Pt-H are active intermediates in the CH
hydrogenation reaction, whereas the edge Pt-H-Pt is a rather inert species. In addition, the measurements indicate that the AlO itself acts as hydrogen storage material by mediating AlO-H and Al-H-Al species, which serve H species in the CH hydrogenation reaction.
飯村 勝道; 細川 甚作; 高橋 澄; 中崎 長三郎
UTNL-R-0321, 0, p.5.1 - 5.10, 1995/03
JMTRでは、種々の照射ニーズに対応するため、各種照射装置の運転を行っている。このうち、OGL-1及びOWL-2は、燃料・材料などの多くの照射試験を実施してきた。これらの照射装置の炉内管は、設計寿命に達したため、原子炉圧力容器から取出し、カナル水中に保管してきた。保管中の炉内管を切断するために切断装置を開発、切断処理を行った。切断作業は、計画どおりに安全に実施することができた。本報告は、切断対象物である炉内管の概要及び今回開発した水中放電切断装置の概要、供用中の原子炉施設内における炉内管の切断処理作業で得た経験などについて紹介する。
